Have an account?
Log in to check out faster.
Flash Deal! Buy 2 merino wool base layers, get a 3rd free with code LAYERUP Shop Now
New, new, new! Shop fresh finds for warmer weather. Shop Now
Text LEAP24 to 47871 to shop an SMS Insider Sale!
Find your perfect pair. Take our New Glove Finder Quiz
Couldn't load pickup availability
The Astroman Long Sleeve Sun Shirt is our best-selling lightweight, technical sun shirt, built with AirVent technology and offering UPF protection and movement-mirroring stretch for all your adventures.
Outdoor Research® gear is guaranteed to perform throughout the lifetime of the product.
Free standard shipping on orders over $99 + easy returns.* Final sale products are non-returnable.
Named after the legendary route in Yosemite Valley, the Astroman L/S Sun Shirt features our best-selling lightweight, stretchy, and durable Astroman fabric for long days on the wall, hiking, paddling, and backpacking.
AirVent technology on the back yoke allows superb airflow and breathability, and built-in UPF 30-50+ sun protection protects skin from harmful UV rays. The Astroman's lightweight, quick-drying fabric is soft next to the skin and delivers the durability required for active outdoor pursuits.
For sunny day outdoor activities where staying shaded and cool is critical, the Astroman L/S Sun Shirt is an elite performance top.
*All sizing is based on your body measurement.We adjust the garment for intended fit and intended use.
Classic fit for comfort and ease of movement.